Ulis by a mile if he maintains his current trajectory.
In SEC play, Ulis is averaging more points per 40 with a higher TS% than Knight. He also is besting Knight in assists, steals, and turnovers per 40.
Ulis (9 games):
PP40 - 21
TS% - 61.1
SP40 - 1.6
AP40 - 7.2
TP40 - 2.2
Knight (16 games)
PP40 - 18.6
TS% - 56.7
SP40 - .5
AP 40 - 4.4
TP40 - 3.1
Ulis still has to go against a few very good defenses before this season is over. Florida and Texas A&M are top 10 in defensive efficiency. Vanderbilt, Georgia, and South Carolina aren't slouches on that end either. All of them are in the top 35 in defensive efficiency, and 4 of the games will be on the road. I expect him to put up better numbers than Knight at the end of the season, but a dip due in part to the defensive treachery that awaits is likely. Dipping from "awesome" to "awesome" wouldn't be concerning.